Gear Shift Device Axial Routing for Sealed Power Tool Housing
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Solution Overview
Problem
Existing gear shift devices for power tools are not compact and often require radial recesses or oblong holes in the gear unit housing, which can lead to leakage of lubricants and compromise the tool's encapsulation.
Innovation Solution
The gear shift device relocates essential components inside the gear unit housing, using a bearing sliding guide and a transmission member like a wire bow that is routed axially through the end face wall, eliminating the need for radial projections and oblong holes, thus encapsulating the gear unit housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wire bow projects through radial through-holes in the gear unit housing to enable shifting, then the gear shift device can be operated, but the housing is not encapsulated and lubricant leakage may occur
Solution Approach 1:
The transmission member is routed from radial projection through the housing wall to axial projection through the end face wall. This dimensional change in the projection direction allows the housing to be fully encapsulated without compromising the transmission function, as the operating element can still access the transmission member through the axial end face opening.
2Ease of operation
If the transmission member is routed radially through the housing wall, then the operating element can be connected, but the housing requires radial recesses or oblong holes that compromise encapsulation
Solution Approach 1:
The transmission member routing is changed from radial direction to axial direction, projecting through the end face wall instead of the circumferential wall. This allows the housing to maintain its radial encapsulation and structural integrity while still providing access for the operating element through the axial end face opening.
3Volume of moving object
If essential components are disposed inside the gear unit housing, then the gear shift device becomes compact, but the transmission member requires routing through the housing wall
Solution Approach 1:
The transmission member is routed axially through the end face wall instead of radially through the circumferential wall. This routing approach maintains compact internal component arrangement while providing a clean, sealed housing structure with the opening positioned at the axial end face rather than the radial surface.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves a compact and sealed gear shift mechanism that prevents lubricant leakage and maintains the tool's structural integrity while allowing for smooth shifting between gear stages.
Implementation Method 1
a bearing sliding guide, in which the transmission member is slidingly guided
Data Source
AI summary
A gear shift device for a shiftable gear unit of a power tool includes a housing, an operating element, and a transmission member that acts upon a displaceable gear unit component. A bearing sliding guide is disposed in the interior of the housing and configured to slidingly guide the transmission member.